Merge pull request #57 from xsleonard/master

Use urljoin for url concatenation
allowing requests versions < 1.0.0
Automatically setting OAuth2Service.access_token in get_access_token
Changing response type to JSON for OAuth2

get_access_token should expect JSON
Merge pull request #61 from appsforartists/master

Automatically set OAuthService.access_token when get_access_token called
removing unnecessary docs/_build/ dir
moving old hook logic into new request module
adding custom Session objects
updating setup.py to require requests v1.x
updating docstrings
updating documentation
abstracting request methods
amending OAuth 2.0 example
not passing back access_token
updating most examples
updating tests, correcting several minor bugs
providing convenience parsing as well as raw response for authorize and request methods
providing raw access token retrieval for OAuth2, general cleanup
only keeping examples with valid, functioning creds
updating unit tests